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Cisco 3750G-24TS does not see Wireless Access Point

Posted on 2011-10-26
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Last Modified: 2013-11-12
I have a number of Cisco Air-LAP1014N-E-K9 access points connected to switches at various sites.  These connect back to a Wireless Lan Controller via spanned VLANS.

Where switches do not provide PoE, AXIS mid span PoE injectors are used.  However, at one location the switch does not see the access point and the port remains in a Down / Down State.

I have done a reset on the port, performed a Shut / No Shut command etc but the switch port does not show a link and the port LED remains unlit.

I've tried another 3750G-24TS and got the same issue.  Is there a compatibility issue between these devices and is there any way this can be rectified?

The firmware on the switch is: 12.2(25)SEE3 (I have other switches running this firmware and see the access points fine).

Model number: WS-C3750G-24TS

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Question by:ABV_UK
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9 Comments
 
LVL 20

Expert Comment

by:RPPreacher
ID: 37030011
How have you tested the injector and AP?  Are you certain that its not a problem with a bad AP or injector or cabling at this 1 defective site?  Sounds more likely than a compatibilty issue, given that all of your other one work.
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Author Comment

by:ABV_UK
ID: 37030026
The injector and access point have all been tested at another site and work fine.
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LVL 20

Expert Comment

by:RPPreacher
ID: 37030034
Cabling at bad site?  Can you test with different cables?
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LVL 47

Expert Comment

by:Craig Beck
ID: 37034002
This is a cabling issue between the AP and the power injector.

Take the AP and the power injector to the switch and plug it all in there if you can.  If that's not possible, take the AP to the power injector and try it.
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Author Comment

by:ABV_UK
ID: 37036592
Not a cabling issue - this has all been tested.

The access point is now seen by the switch if I configure the port to 100MB, despite both the ports on both sides being GB ports.  Setting the port to auto negotiate or 1000MB seems to cause the issue.

For now this is working, I just need to find out why the ports won't run at full capacity.
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LVL 47

Expert Comment

by:Craig Beck
ID: 37036799
If the fast-pulse is not detected along the cable the port won't auto-negotiate.  This is usually due to a bad cable, or sometimes noise such as electricity cables close to your Cat5 or Cat6.
Also if one of the pairs is not terminated properly the fast-pulse won't reach the other end, so negotiation usually doesn't work.

The fact that the AP works at 100MB does not mean the cabling is ok, just that pairs 1 and 3 are ok.
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LVL 20

Expert Comment

by:RPPreacher
ID: 37036932
I think with 3 different experts pointing to cabling, you should probably test with new cables.
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Accepted Solution

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ABV_UK earned 0 total points
ID: 37138028
As no answer has come up, the only work around is to run this at 100MB.
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Author Closing Comment

by:ABV_UK
ID: 37166454
This is just a work around as the real answer was not found.
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